Another point of view ... YOU MAY DISAGREE
I respectfully disagree with a lot that has been stated in this thread.
Power and power amps are highly overated!
I have a Marantz 1060 that is over 35 years old and still works perfectly.
Marantz is a good amp but not the quality of a McIntosh, Crown, Rotel or some of the other high end amps mentioned here. Claas D amps are all basically the same despite all the specs differnet vendors produce.
Clipping occurs rarely unless you are significantly mismatched or try to always drive you speakers with the AVR and/or external amp at its limits. If this is occurring you have bigger problems than you can imagine.
And yes, sometimes adding more power will help the soound ,if you have you present receiver and/or amp combination turned up all the way.
And more power, can not help old dying 15 years or older speakers. Speaker technology has advance a lot in just the last 5 or 10 years. Sometimes you just have to bite the bullet and buynewspeakers.
I have A Marantz SR8002 which provide 125 watts per channel and is plenty to drive Def Tech 7002s much louder than I can stand and I like loud TV and movies.
Also remember power is logrithmic. To get a 3dB gain you have to double the power. 200 watts provides a 3dB gain over 100 watts. 1000 watts only provides a 10 dBgain over 100 watts.
If you really feel you need more power, I personally would get a Behringer EP2500 for less than $300 which will provide 450 watts per channel into 8 ohms for 2 channels if I needed an external amp.
Thenthere is also capacitance and inductance that causes the impedance to vary with frequency and therefore the required power. Then there is the resistive part of speakers that varies with temperature load and winding age and cone resilence. Then you need to understand the difference between peak-to-peak and rms (root mean squared) watts and what the speaker watts range really mean ..but hey, not everyone is an electrical engineer.
The laws of physics and eletron travel can not be changed even though some cable/wire manufactures try to get you to think they can.
Peace to those who disagree or have different opinions.
NJ